Oklahoma State University

This is a Before Class Exploration on stoichiometry. To answer the questions on this BCE it is OK to use your textbook, but if you can answers the
questions without it that is OK too.

Answer all of the questions below. If you
do not know an answer enter CNA. However, it will help the most if you answer
each question with your best intuition/idea about what would be a reasonable
answer.

First Name:

Last Name:

School:

1a. Enter the formula for the element, hydrogen.

b) Enter the formula for the element oxygen.

c) Enter the formula for the compound water.

d) Write the balanced chemical equation (using whole number coefficients) that describes the reaction of hydrogen plus oxygen to form water.

2a. The Figure I. below depicts the particulate level (submicroscopic) representation of a container (the box on the left) with a mixture of hydrogen and oxygen molecules before a reaction occurs, and the same container (the box on the right) after a reaction occurs.

Write the balanced chemical equation (using whole number coefficients) that describes the reaction of hydrogen plus oxygen to form water.

Figure I.

b. The Figure II. below depicts the particulate level (submicroscopic) representation of a container (the box on the left) with a mixture of hydrogen and oxygen molecules before a reaction occurs, and the same container (the box on the right) after a reaction occurs.

Write the balanced chemical equation (using whole number coefficients) that describes the reaction of hydrogen plus oxygen to form water.

Figure II.

c) The Figure III. below depicts the particulate level (submicroscopic) representation of a container (the box on the left) with a mixture of hydrogen and oxygen molecules before a reaction occurs, and the same container (the box on the right) after a reaction occurs.

Write the balanced chemical equation (using whole number coefficients) that describes the reaction of hydrogen plus oxygen to form water.

Figure III.

3. What is different about the three Figures shown above?

4. What is the same about the three Figures shown above?

5a. The Figure IV. below depicts the particulate level (submicroscopic) representation of a container (the box on the left) with a mixture of hydrogen and oxygen molecules before a reaction occurs, and the same container (the box on the right) after a reaction occurs.

Write the balanced chemical equation (using whole number coefficients) that describes the reaction of hydrogen plus oxygen to form water.

Figure IV.

b) What is different about the Initial condition in Figure IV compared to Figures I - III?

6. Is there anything about the questions that you feel you do not understand?
List your concerns/questions.

7. If there is one question you would like to have answered in lecture,
what would that question be?